The best way to get rust stains out of your clothing is to use a lemon, or table salt and cream of tarter. To use salt and cream of tarter, simply make a mixture using equal parts of both.
Lay your garment on a flat surface on top of a towel.
Spread your cream of tarter and salt mixture onto the rust stain.
Place your garment in the sun and allow it to dry.
if the rust stain has lifted, launder the shirt.
at 6:31 PM on Jul. 7, 2008